# Project Current Status & Rules

- **Objective:** Maintain, review, and enhance the CheckFlow self-hosted TickTick-style task management web application according to specifications in `AGENTS.md`, ensuring full feature integrity, security compliance, clean code quality, and responsive UX across all devices.

- **Core Architecture & Source Structure:**
  - `src/app/`: Next.js App Router root layouts, providers, auth/demo/admin views, and REST/CalDAV API endpoints (`/api/tasks`, `/api/lists`, `/api/import`, `/api/dav/[...path]`).
  - `src/components/layout/`: `AppShell.tsx` (3-panel main layout, resizer coordination, mobile drawer overlay), `Sidebar.tsx` (draggable resizer, lists tree, tag & trash navigation, profile, import & export popover, admin console link).
  - `src/components/tasks/`:
    - `TaskList.tsx`: Recursive n-depth hierarchical checklist, Notion-style 6-dot drag handle (`⋮⋮`) with DND reordering, inline title editing (`F2`/double-click), right-aligned hover subtask trigger, 6-second interactive Undo toast banner.
    - `TaskDetail.tsx`: Right-side detail panel, modular block swap (Subtasks ⇄ Markdown Note), mouse drag split resizer, mobile bottom-sheet with swipe-down dismissal.
    - `MarkdownNoteEditor.tsx`: Distraction-free text/markdown note canvas with DOMPurify sanitization & preview rendering.
    - `KanbanView.tsx`: CheckFlow Labs 3-column Kanban board view (`To Do` / `In Progress` / `Done`).
  - `src/components/settings/`: `SettingsModal.tsx` (Profile, Preferences, Labs, Integrations/CalDAV, Admin tabs).
  - `src/lib/`: `userPrefs.ts` (global user customization state store), `useUserPrefs.ts` (reactive preferences hook & CSS variable injector), `i18n/` (modular EN/KO/JA localization dictionaries: `types.ts`, `locales/en.ts`, `locales/ko.ts`, `locales/ja.ts`), `mockData.ts` (LocalStorage demo store), `auth.ts`, `prisma.ts`.
  - `src/middleware.ts`: Route-level auth and admin role verification guard.

- **Completed So Far:**
  - Standardized complete localization across all 3 supported languages (EN, KO, JA) without partial fallback leaks; translated all Settings Modal tabs (Profile, Preferences, Labs, Sync Integrations, Admin) and interactive guides (v0.7.1).
  - Resolved list header rename layout shift bug where editing list title pushed the completed items toggle button (v0.7.1).
  - Enhanced Markdown Note Editor preview/editor canvas alignment and unified description typography heights (v0.7.1).
  - Standardized Task Detail priority picker into a sleek custom popover chip matching the central quick-add toolbar (v0.7.1).
  - Rewrote entire Git commit history with active local Git identity across all branches and tags, and force-pushed to self-hosted Gitea remote origin.
  - Conducted full audit of codebase against all specification items in `AGENTS.md`.
  - Verified 100% implementation of core features: n-depth recursive checklist, real-time subtask synchronization, modular blocks & split resizer, 3-way theme (VSCode dark / pastel light / system), global `UserPrefs` customization, Labs Kanban view, and mobile bottom sheet.
  - Enhanced CalDAV / DAVx⁵ synchronization endpoint (`src/app/api/dav/[...path]/route.ts`) with full RFC 4791 support: `OPTIONS`, `PROPFIND` (principal & calendar collection discovery), `REPORT` (calendar-query/multiget), `PUT` (task upsert from VTODO), and `DELETE`.
  - Upgraded Settings Modal "Integrations (CalDAV)" tab with multi-platform interactive guides (Android/DAVx⁵, Apple Reminders, Thunderbird), one-click URL copy feedback, ICS feed direct download, and live endpoint test ping.
  - Implemented full-fidelity standard Task Export pair (`/api/export`) supporting RFC 4180 / TickTick-compatible CSV with UTF-8 BOM, and RFC 5545 iCalendar (`.ics` VTODO) format.
  - Added Export modal in Sidebar user popover menu supporting format selection, target list filtering, completed tasks inclusion toggle, and seamless Demo mode client-side Blob generation.
  - Refactored `i18n` into a clean modular dictionary architecture (`src/lib/i18n/types.ts`, `locales/en.ts`, `locales/ko.ts`, `locales/ja.ts`) with 100% dictionary completeness and natural phrasing across English, Korean, and Japanese.
  - Enhanced Admin console (`src/app/admin/page.tsx`), Settings Modal Admin tab, and Middleware to seamlessly support both authenticated ADMIN users and Demo mode admin preview.
  - Added Admin Console direct entry in Sidebar user popover menu for swift navigation.
  - Fixed Docker container runtime Prisma migration dependencies by adding `effect` and ensuring full `node_modules` availability in the production runner stage of `Dockerfile` for seamless entrypoint `prisma migrate deploy`.
  - Refined `docker-compose.yml` and `.env.example` to support standalone 2-file deployment (`docker-compose.yml` + `.env`) without cloning source code, public registry images (`CHECKFLOW_IMAGE`), Watchtower auto-updating labels, and automated database migrations.
  - Automated Gitea Actions CI workflow (`.gitea/workflows/docker-build.yaml`) for building & pushing container images to Gitea Container Registry with lowercase repository name normalization (`env.REPO`) and OCI source labels (`org.opencontainers.image.source`) for automatic repository package linkage.
  - Completely revamped `README.md` to reflect universal 2-file Docker deployment for general users, Watchtower auto-update, architecture, and open-standard CalDAV sync guidelines.
  - Enhanced Task Row UX & Interactive Undo Toast (v0.6.3): Notion-style 6-dot drag handle (`⋮⋮`), DND reordering, `F2` inline editing, right-aligned subtask button, and 6-second floating Undo toast banner.
  - Completely redesigned Left Sidebar UI/UX (v0.7.0): Brand checkmark SVG logo, centered matte search box (Ctrl+K), bottom-docked user card, fixed list redirect bug on trash selection, and synchronized live trash counter.
  - Minimal & Matte Kanban View Switcher (v0.7.0): Compact single toggle visible only when Kanban is enabled in Labs, with seamless real-time switching.
  - Markdown Note Editor defaulting to Preview mode with one-touch toggle button (v0.7.0).
  - Real-time Optimistic UI updates for subtask inline addition & checklist checkbox clicks without requiring page refreshes (v0.7.0).
  - Auto-promotion of the first-ever registered user to ADMIN role on self-hosted instances (v0.7.0).
  - Full N-depth tree drag-and-drop (DND) reordering for main tasks and subtasks with LocalStorage persistence (v0.7.0).
  - Recursive soft-delete cascading (deleting a parent task automatically soft-deletes all descendant subtasks) in both Prisma database and LocalStorage mock store (v0.7.0).
  - Real-time Admin console API endpoints (`/api/admin/stats`, `/api/admin/users`) with Live/Demo duality (v0.7.0).
  - Validated that `npm run lint` and `npm run build` execute with 0 errors and 0 warnings.

- **Next Steps (Todo):**
  - Continuous refinement of user experience based on feedback.
  - Enhance keyboard accessibility & global shortcuts (shortcuts for switching list/kanban view, quick task navigation, Command Palette bindings).
  - Add optional automatic synchronization background polling / webhook integration if requested.
  - Plan next feature iterations or custom integrations as requested by user.

- **Caveats & Absolute Rules:**
  - **Security & Multi-user Privacy**: All API endpoints must strictly verify session ownership (`userId === session.user.id`) and list ownership before creating/updating/deleting tasks or lists.
  - **Sanitization**: Never render raw HTML without DOMPurify; always sanitize CSV/ICS user inputs against formula injection (`sanitizeFormula`).
  - **Admin Gatekeeping**: Admin routes must strictly require `role === "ADMIN"` both on server/middleware and client.
  - **User Customization Priority**: Any new UI preferences (sizes, positions, order) must be persisted through `userPrefs.ts` and respect the "Reset to Defaults" Labs option.
  - **i18n Consistency**: Any newly added UI string must be translated across all 3 language dictionaries (`en`, `ko`, `ja`) in `src/lib/i18n/locales/`.
  - **Mobile Bottom-Sheet Convention**: Maintain touch gestures (`mobile-open` class, Y-axis swipe threshold > 120px) for the detail panel on mobile screens.